<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <p>c 的值是 {{c}}</p>
<div>B的值{{c}}</div>

<input type="text" v-model ="b" name="" id="">
  </div>
<script src="./mvvm.js"></script>
  <script>
    let vm = new VM({
      el:'#app',
      data:{c:'c' }
    })
  </script>
</body>
</html>